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Sony STR-D715 Protect Mode

I have a Sony STR-D715 that I'm working on. I picked it up from a guy who said it stayed in protect mode. I had it on my bench with nothing hooked up to it and it is in protect mode. So I do some looking and I notice that a few parts on the right channel where burned. A couple transistors and 2 resistors later, I replaced the noticably burned parts and parts with shorts on them. I can't find any more shorts and it is still in protect mode. I might have narrowed it down to the stk3102 amp but I'm not sure how to check the part to see if it is working properly. Does anyone have experience with this or know a quick and dirty way to check the amp ics? I have the schematics for it if someone needs those to look at. Thanks

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Hello,
This is a common problem...
It is in fact a bad power-amp module.
I have repaired quite a few of these receivers by replacing it.
The module is inexpensive. I Googled the Part number and found several sources for it.

Good luck!

Posted on Oct 10, 2009

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Posted on Jan 02, 2017

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I didn't see any mention of it in the STR-D565 manual, but on many other Sony models the "Protect" indicates a short in a speaker wire.

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Disconnect all speaker wires at the receiver and turn the unit back on. If it stays on, your receiver is ok and you need to reconnect speakers one by one and test until you find the one causing the "protection" once you find this, disconnect the wire at the speaker and test again. make sure the + and - wires do not touch! If the receiver stays on, use a multimeter to test the speaker for a short with resistance check. If your not sure how to do this, any home audio shop will test it for free and while you wait. If speaker wires are disconnected and it still shuts down, it needs to be serviced. Hope this helps

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Sony str-d715 flasses protector


Protet mode is a special diagnostic mode that starts when a fault is detected.

When in protection mode the unit is prevented from starting by protection circuit, so to prevent further damage.

Check the speakers and speakers wiring, a contact in speaker wires, or faulty speakers can send the unit in protection.

Try unplugging power cable for one hour or so. then connect cable back and see if you get rid of protect state. Sometimes accumulation of electrostatic charges inside circuit capacitors can kick in protect mode. In that case unplugging the unit from main for some times can get rid of electrostatic charges, and reset circuits by draining power completely.
If that was the problem, you will not get Protect when plugging back power cable.

If you do all the above and still get Protect, then there is a real fault.

In that case the unit may be disassembled and tested to find the fault.

If that is the case I suggest contacting the manufacturer at the number listed on the owners manual, or asking a quote on repair to a local technician.

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You've blown it. It recognizes a potentally harmful situation and goes into protect mode.

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Speakers shorted out, blew a fuse. Replace the unit or (cross your fingers and) open up the box and find the blown fuse.

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